MB number is 104-180-03-09

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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
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44 years foreign automotive repair
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190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

to the original poster-it is not an oil heater, it's an oil COOLER. do not block it off. it has a job to do. good luck, chuck.

M103 engines don't use it.
Oil works better if its hotter, synthetics are happy up to 150deg c.

We just finished removing the heat exchanger and fitted a 6mm plate under the cover and the oil pressure is fine.

If you're adamant you want an oil cooler then fit a common air to liquid cooler.